Has anyone looked at patents:

US4429280 - Apparatus for DEmodulation of Modulated Curl-Free Magnetic
Vector Potential

US4429288 - Apparatus for modulation of a Curl-Free Magnetic Vector
Potential Field

US4432098 - Apparatus for transfer of Information by means of a
Curl-Free Magnetic Vector Potential Field

US4447779 - Apparatus for Determination of a Receiving device utilizing
a Curl-Free Magnetic Vector Potential Field.

US4605897 - Apparatus for distance determination between receiving
device utilizing a Curl-Free Magnetic Vector Potential Field.

US4491795 - Josephson Junction Interferometer Device for detection of
Curl-Free Magnetic Vector Potential field.

These were patented by Raymond C. Gelinas of Concord MA, and assigned to
Honeywell, Inc.

I have no idea of the range of this type of communications system,
frequencies used, or even the bandwidth you could achieve.

What is Curl-Free transmission anyway?

"PagCal" wrote in message
...
Has anyone looked at patents:

US4429280 - Apparatus for DEmodulation of Modulated Curl-Free Magnetic
Vector Potential

US4429288 - Apparatus for modulation of a Curl-Free Magnetic Vector
Potential Field

US4432098 - Apparatus for transfer of Information by means of a
Curl-Free Magnetic Vector Potential Field

US4447779 - Apparatus for Determination of a Receiving device utilizing
a Curl-Free Magnetic Vector Potential Field.

US4605897 - Apparatus for distance determination between receiving
device utilizing a Curl-Free Magnetic Vector Potential Field.

US4491795 - Josephson Junction Interferometer Device for detection of
Curl-Free Magnetic Vector Potential field.

These were patented by Raymond C. Gelinas of Concord MA, and assigned to
Honeywell, Inc.

I have no idea of the range of this type of communications system,
frequencies used, or even the bandwidth you could achieve.

What is Curl-Free transmission anyway?

lets see, if the magnetic field doesn't have any curl then there is no
electric field created. so basically you have a static magnetic field. so
modulating it doesn't make much sense as then it would have a non-zero curl.
as far as receiving it there are devices to detect static magnetic fields,
and a josephson junction may be able to do that.

The 3'd patent talks about 'transfer of information', but
I don't know the range.

David Robbins wrote:
"PagCal" wrote in message
...

Has anyone looked at patents:

US4429280 - Apparatus for DEmodulation of Modulated Curl-Free Magnetic
Vector Potential

US4429288 - Apparatus for modulation of a Curl-Free Magnetic Vector
Potential Field

US4432098 - Apparatus for transfer of Information by means of a
Curl-Free Magnetic Vector Potential Field

US4447779 - Apparatus for Determination of a Receiving device utilizing
a Curl-Free Magnetic Vector Potential Field.

US4605897 - Apparatus for distance determination between receiving
device utilizing a Curl-Free Magnetic Vector Potential Field.

US4491795 - Josephson Junction Interferometer Device for detection of
Curl-Free Magnetic Vector Potential field.

These were patented by Raymond C. Gelinas of Concord MA, and assigned to
Honeywell, Inc.

I have no idea of the range of this type of communications system,
frequencies used, or even the bandwidth you could achieve.

What is Curl-Free transmission anyway?


lets see, if the magnetic field doesn't have any curl then there is no
electric field created. so basically you have a static magnetic field. so
modulating it doesn't make much sense as then it would have a non-zero curl.
as far as receiving it there are devices to detect static magnetic fields,
and a josephson junction may be able to do that.

"PagCal" wrote in message
...

What is Curl-Free transmission anyway?

That's when you send a fax to someone who is
not using one of those old obsolete Panasonic
or Sharp fax machines because their too damm
cheap to go out and buy a plain-paper fax
like everyone else has already.

(obsessive frugality is a 'common issue' with ham radio
operators and HO model train enthusiasts you see... )

I believe a Hall Effect device does the same thing!!


lets see, if the magnetic field doesn't have any curl then there is no
electric field created. so basically you have a static magnetic field. so
modulating it doesn't make much sense as then it would have a non-zero curl.
as far as receiving it there are devices to detect static magnetic fields,
and a josephson junction may be able to do that.

"Dave Shrader" wrote in message
news:d8crb.147467$Fm2.128906@attbi_s04...

I believe a Hall Effect device does the same thing!!

Hall effect, essentially magnethydrodynamics in a solid block of
semiconductor.
electrons flowing from top to bottom are deflected to left or right, by a
field through the third axis.
Detects static fields just fine.